-V0+ is -V0 with extra properties. These properties can improve upon difficult-to-encode spots in the music like temporal smearing issues as with problem sample eig or with tremolo problem isues as with problem sample lead-voice. eig and lead-voice are fine to me when using -V0+.

How is it done?

-V0+ uses a strategy which is targeting at providing maximum possible audio data space for hard-to-encode spots in the music. -V0+ increases the accuracy demands for spots in the music with detected impulses, and it has a general demand for audio data bitrate to stay rather high.

What’s the price to pay?

Average bitrate goes up a little bit. For my standard test set of various pop music average bitrate is 256 kbps with -V0+, whereas -V0 takes 252 kbps.Moreover, in order to prevent another 10 kbps increase in average bitrate, the fast and lossless mp3packer procedure is recommended to be called for the produced mp3 file. Used with a bat file invoked from the explorer’s folder context menu this is comfortably done for the mp3 files of an entire folder.The 10 kbps bitrate bloat is a consequence of the strategy for providing maximum possible data space. For doing so a 17.5 kHz lowpass is also used internally. If you don’t like that use a lowpass according to your likings. But even if you are able to distinguish higher frequencies in an isolated listening test, this doesn’t mean you can take profit of that with real life music. Not talking about the fact that the musical contents of higher frequncies is next to nothing.